Statistics

Coin Flip Probability Calculator

Find the chance of exactly k heads in n flips.

Calculated Output

Probability (%) 24.609

Formula: P = C(n,k) × 0.5ⁿ

Step-by-Step Breakdown

1. Values used:

2. Number of flips = 10

3. Number of heads = 5

5. Probability = 24.609%

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The math behind it

P = combinations C(n,k) × (1/2)ⁿ for a fair coin.

Exactly 5 heads in 10 flips → 24.6%.

At least k?

Sum the probabilities for k, k+1, … up to n.